<template>
    <div>
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>商品分类</el-breadcrumb-item>
        </el-breadcrumb>
        <el-card>
            <el-row>
                <el-col>
                    <el-button type="primary" @click="showAddCateDialog">添加分类</el-button>
                </el-col>
            </el-row>
            <tree-table class="treeTable" :data="cateList" :columns="columns" :selection-type="false" :expand-type="false" 
                show-index index-text="#" border :show-row-hover="false">
                <template slot="isok" slot-scope="scope">
                    <i class="el-icon-success" v-if="scope.row.cat_deleted === false" style="color: lightgreen;"></i>
                    <i class="el-icon-error" v-else style="color: red;"></i>
                </template>
                <template slot="order" slot-scope="scope">
                    <el-tag size="mini" v-if="scope.row.cat_level === 0">一级</el-tag>
                    <el-tag type="success" size="mini" v-else-if="scope.row.cat_level === 1">二级</el-tag>
                    <el-tag type="warning" size="mini" v-else>三级</el-tag>
                </template>
                <template slot="opt" slot-scope="">
                    <el-button type="primary" icon="el-icon-edit" size="mini">编辑</el-button>
                    <el-button type="danger" icon="el-icon-delete" size="mini">删除</el-button>
                </template>
            </tree-table>
            <el-pagination @size-change="handleSizeChange" @current-change="handleCurrentChange" :current-page="queryInfo.pagenum"
                :page-sizes="[3, 5, 10, 15]" :page-size="queryInfo.pagesize" layout="total, sizes, prev, pager, next, jumper" :total="total">
            </el-pagination>
        </el-card>
        <el-dialog title="添加分类" :visible.sync="addCateDialogVisible" width="50%" @close="addCateDialog">
            <el-form :model="addCateForm" :rules="addCateFormRules" ref="addCateFormRef" label-width="100px">
                <el-form-item label="分类名称:" prop="cat_name">
                    <el-input v-model="addCateForm.cat_name"></el-input>
                </el-form-item>
                <el-form-item label="父级分类:">
                    <el-cascader v-model="selectedKeys" :options="parentCateList" :props="cascaderProps"
                        @change="parentCateChange" clearable change-on-select></el-cascader>
                </el-form-item>
            </el-form>    
            <span slot="footer" class="dialog-footer">
                <el-button @click="addCateDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addCate">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>
export default {
    data() {
        return {
            cateList: [],
            queryInfo: {
                type: 3,
                pagenum: 1,
                pagesize: 5
            },
            total: 0,
            columns: [{
                label: '分类名称',
                prop: 'cat_name'
            },{
                label: '是否有效',
                type: 'template',
                template: 'isok'
            },{
                label: '排序',
                type: 'template',
                template: 'order'
            },{
                label: '操作',
                type: 'template',
                template: 'opt'
            }],
            addCateDialogVisible: false,
            addCateForm: {
                cat_name: '',
                cat_pid: 0,
                cat_level: 0
            },
            addCateFormRules: {
                cat_name: [
                    { required: true, message: '请输入分类名称', trigger: 'blur' }
                ]
            },
            parentCateList: [],
            cascaderProps: {
                value: 'cat_id',
                label: 'cat_name',
                children: 'children',
                expandTrigger: 'hover'
            },
            selectedKeys: []
        }
    },
    created() {
        this.getCateList()
    },
    methods: {
        async getCateList() {
            const { data: res } = await this.$http.get('categories', { params: this.queryInfo })
            if(res.meta.status !== 200) return this.$message.error('获取商品分类失败')
            this.cateList = res.data.result
            this.total = res.data.total
        },
        handleSizeChange(newSize) {
            this.queryInfo.pagesize = newSize
            this.getCateList()
        },
        handleCurrentChange(newPage) {
            this.queryInfo.pagenum = newPage
            this.getCateList()
        },
        showAddCateDialog() {
            this.getParentCateList()
            this.addCateDialogVisible = true
        },
        async getParentCateList() {
            const { data: res } = await this.$http.get('categories', { params: { type: 2 } })
            if(res.meta.status !== 200) return this.$message.error('获取父级分类数据失败')
            this.parentCateList = res.data
        },
        parentCateChange() {
            if(this.selectedKeys.length>0){
                this.addCateForm.cat_pid = this.selectedKeys[this.selectedKeys.length-1]
                this.addCateForm.cat_level = this.selectedKeys.length
                return
            }else{
                this.addCateForm.cat_pid = 0
                this.addCateForm.cat_level = 0
            }
        },
        addCate() {
            this.$refs.addCateFormRef.validate(async valid => {
                if(!valid) return
                const { data: res } = await this.$http.post('categories', this.addCateForm)
                if(res.meta.status !== 201) return this.$message.error('添加分类失败')
                this.$message.success('添加分类成功')
                this.getCateList()
                this.addCateDialogVisible = false
            })
        },
        addCateDialog() {
            this.$refs.addCateFormRef.resetFields()
            this.selectedKeys = []
            this.addCateForm.cat_level = 0
            this.addCateForm.cat_pid = 0
            this.addCateDialogVisible = false
        }
    }
}
</script>

<style lang="less" scoped>
.treeTable {
    margin-top: 15px;
}
.el-cascader {
    width: 100%;
}
</style>